What's New
- iriver Lplayer teardown
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- Robotic locomotion
- Finding value in work
- ZFS: the final straw
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- Running AbstractSpoon ToDoList under Wine
- Aoyue 906 Hot Air Rework Station review
- What I learned from setting up ZFS on my fileserver
- Nokia E65 review: how does it stack up against a 5-year-old Siemens ME45?
- Extending battery life on the Dell XPS M1210
- A quick guide to using MySQL in Python
- Market segments and tactility: the new Apple iPhone
- Cree XR-E LEDs
- What's New block for Drupal
- Google calendar for Sydney adventure and MTB races
- Background Check Antivirus
- Multithreading and performance
- DVI on laptops
- Dell XPS M1210 review
- Improving university for developers
- Automatic Wealth for Grads, by Michael Masterson
- Converting Access databases to PHP/MySQL webapps
- Testing the board
- Assembly
- Making a PCB
- Random bits and pieces
- One weekend, one PCB layout
- Commitment
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- The things you find...
- Playing catchup
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- What type of business?
- Introduction
- New look
- Integrating the H-bridge and its controller
- Using CPLDs and FPGAs in hobby electronics
- A simple logic analyzer
- I2C-based H-bridge controller with PWM
- The virtues of small development teams
- Building a Sumo robot (summary)
- High-power LED mountain bike light
- Optimizing your Start menu for fast program access
- The best batteries in the world...
- Battery-powered USB iPod charge cable that requires no special components
- How to build a simple Luxeon LED bike headlight
Cree XLamp 7090 XR-E
The Cree XLamp 7090 XR-E is brighter than the Luxeon K2, and uses half the power. The only problem seems to be getting optics for them. Most of the available optics are intended for the 7090 XR which has a 100 degree beam, whereas the 7090 XR-E has a 75 degree beam. I've ordered some XR-Es and some lenses meant for the XR, and I'll see how well it works. I might end up having to wait another 3-6 months until the optics suppliers have new lenses available. I've probably used the same supplier as you, but I've had good service. They have been honest about delivery times and delays so far.
Regarding the difference in beam width between your commuting and mountain bike light, be aware that some optics are listed as full beam width, and some as half beam width. Some specify the beam width for monochromatic light. So the 6 degree Polymer Optics lens is actually 6 degree half angle, 12 degree full angle, and closer to 18 degree full angle with white light.